218 



silvery shimmer especially on the front pair ; pubescence longer and 

 darker, there being much more longer black hairs on the two pairs of 

 the posterior tibiae which are forming rather conspicuous black fringes 

 especially on the middle tibiae ; pulvilli lighter yellowish. 



Abdomen narrower, somewhat conical, about as long as or less, 

 than the head and thorax (including the scutellum) together ; middle 

 row of spots much less distinct, more shorter and flatter, never ex- 

 tending up to the foremargins ; side rows of spots somewhat lunulate 

 and less oblique, and much more separated from the hind margins by 

 a rather distinct blackish intervals ; the brownish colouring about the 

 sides of the second segment usually more expanded ; pubescence longer, 

 especially on the sides and down the sidemargins, and near the side- 

 margins of each segment there are conspicuous long black hairs about 

 the middle rather near the hindmargins, especially on the basal two 

 segments more conspicuous ; ventre as in the female but the pubes- 

 cence much longer and more abundant and more erect, especially about 

 the middle part of each segment, the black bristly hairs on the seventh 

 segment more extending up to the preceding segment or sometimes 

 to the fifth segment. 



Length: 14-15 mm. 



In Japan there is no allied species, but this species in appearance 

 has a resemblance to Tabanus amaenns, Walker. However, it is at 

 once distinguished from that by two separated roundish calli on the 

 broad frontal stripe in the female ; and by the quite isolated triangles 

 of the middle row on the dorsal abdomen, by less distinct greyish 

 stripes on the thorax, and by the blackish antennae, in the both 

 sexes. 



The Japanese materials I possess are rather greyer and smaller 

 than the European form, varying very little in the colour of the third 

 joint of the antennae, which ranges from its normal dull black, though 

 more or less reddish brown its base, to entirely dark reddish brown 



